Minecraft – How to check if an entire team has died

minecraft-commandsminecraft-java-edition

I'm making a Minecraft minigame map using commandblocks (no code or mods). One of the game end conditions is that a team is eliminated.

How to I reliably check that a team has no members left alive on it?

I am using 1.8, and this will (obviously) be multiplayer

Best Answer

First set up an objective tracking player death, similar to what I outlined in my answer here. For the following, I assume that this objective is named hasDied and there are two teams, red and blue.

Instead of the testfor command in that answer, you can use

/testfor @a[team=red,score_hasDied=0]

Invert the redstone output, so that it turns on when nobody is left alive in team red and continue from there. Do the same thing for the blue team.

Related Solutions

Minecraft – How to teleport players based on their teams

Information taken from the wiki:
http://minecraft.gamepedia.com/Scoreboard#Teams

To teleport players in specific teams, simply add the team=[name] filter onto the @p command, resulting in:

/tp @a[r=10,team=red] 100 100 -100

Just note that everything is CaSe SeNsItIvE (Case sensitive). It means that 'red' is different to 'Red'. Replace the word 'red' with the name of the team.

To set make team, use
/scoreboard teams add [name] [display name... (This can be more than one word)]

And to add a player to the team, use
/scoreboard teams join [team] [player]

Minecraft – How to Use /testfor Command to Check Item in Player’s Inventory

It's very difficult to see whether someone has an object anywhere in their inventory. That would take 36 command blocks, one for each slot! You can, however, take the object, then see if taking the object worked.

The Commands

Set up a fast clock (but not as fast as a fill clock)
One command block does /clear @p iron_ingot 0 1 (clears 1 iron ingot from the nearest player. You can choose which player, but it must be exactly one. Also, you must use the same selector throughout all these commands.)
Run a comparator from that command block to another command block running this command: /scoreboard players add @p ironIngots 1 (Increases the player's ironIngots score by 1. Make sure you create ironIngots first!)
Create another command block that does whatever you want. In the case of giving them a diamond, you would do this: /give @p[score_ironIngots_min=10] diamond. Note the target selector; it gives the player the diamond only if their ironIngots score is 10 or greater.
The last thing you want to do is take the ironIngots score away so they don't keep getting items. Just run /scoreboard players remove @p[score_ironIngots_min=10] ironIngots 10. This removes 10 iron ingots from the player if they have an ironIngots score of 10 or greater. Any player who matches this will have received a diamond in the previous step.

How to Set Them Up

The commands listed above must run in order. It is actually very simple to put them in order. Just open the debug menu and look at the stylish new crosshair. Align the command blocks along either the green or red line so that one of those lines points down the first to the last command block.

Notes

You don't have to press a button to use this, you just have to be the nearest player. You can change the command to the nearest player within 10 blocks, nearest player on a team, etc.
The commands will take a short amount of time to finish, but for 10 iron ingots, it will only take half a second. It's one tick (1/20 of a second) per item taken away.
It will take away iron ingots even if you don't have ten. However, you can submit one, then later submit five, then submit four more later, and it will still give you the diamond. You can also submit 14 at a time and the extra 4 will be saved for later.